@chegewara: I checked the rainmaker example you pointed me to, and the firmware my ESP32-C3-DevKitM-1 came installed width seems to behave the same way (user button toggling the LED on/on) - thank you very much for this lead.I can now look at the rainmaker SDK in order to understand why I can use th...

@chegewara: Thank you. You may refer to the usb-jtag interface, because the external (using GPIO pins) interface is working on my revision 2 ESP32-C3-DevKitM-1 (not with the blink SDK example though).

@ESP_Minatel: I am not changing any GPIO strapping, on the board. The JTAG interface is working when the board is running the firmware it came installed with, and is not when I am running the blink example. Any clue why the blink example is not working on my ESP32-C3-DevKitM-1 revision2 from the sdk...

@ESP_Minatel: And no, I don't mean the console output, I mean a Jlink debug probe connected to the proper pins of the esp32-c3, using openocd-esp32, as described https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/api-guides/jtag-debugging/index.html , with the following configuration file...

I have revision 2 of the chip: esptool.py esp32c3 -p /dev/ttyUSB0 -b 460800 --before=default_reset --after=hard_reset write_flash --flash_mode dio --flash_freq 80m --flash_size 2MB 0x0 bootloader/bootloader.bin 0x10000 blink.bin 0x8000 partition_table/partition-table.bin esptool.py v3.1-dev Serial p...

@ESp_Minatel Here it is. Is there any information available on how enabling the JTAG in a ESP32-C3-DevKitM-1 project ?

@ESP_Minatel: Yes, I tried https://github.com/espressif/esp-idf/tree/master/examples/get-started/blink following the instructions, to no avail. Besides, JTAG seems to be disabled in this demo. Is there any documentation explain how to enable the JTAG on the /examples/get-started/blink demo project ?...

@chegewara: Thank you.

@ESP_Minatel: Well, If I erase the flash and reset the ESP32-C3-DevKitM-1, the pale blue LED would be off. If I dump the flash from a second ESP32-C3-DevKitM-1 device out-of-the-box and re-flash first one with the extracted flash content, then reset it, the pale blue LED would be on again, and the J...

Where can I find the software that is flashed by default in the ESP32-C3-DevKitM-1 development board ? I built the blinky project present in esp-idf revision 9d34a1cd42f6f63b3c699c3fe8ec7216dd56f36a dated Tue Apr 27 08:52:09 2021 +0000, but is does doing anything, and has JTAG disabled. The default ...